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res_rtp_asterisk: trigger source change control frame when dtls is established

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There needed to be a way to notify handlers upstream that DTLS had been
established. This patch makes it so once DTLS has been estalished a source
change control frame is put into the read queue. Any handlers can then watch
for that frame and trigger off of it.

ASTERISK-27096 #close

Change-Id: I27ff344f5a8c691a1890dfe3254a4b1a49e7f4a0
This commit is contained in:
Kevin Harwell
2017-06-29 14:56:10 -05:00
parent 366971827a
commit 7df7b8a90c
1 changed files with 19 additions and 1 deletions
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20
res/res_rtp_asterisk.c
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@@ -109,6 +109,8 @@
#define SRTP_MASTER_SALT_LEN 14
#define SRTP_MASTER_LEN (SRTP_MASTER_KEY_LEN + SRTP_MASTER_SALT_LEN)
#define RTP_DTLS_ESTABLISHED -37
enum strict_rtp_state {
STRICT_RTP_OPEN = 0, /*! No RTP packets should be dropped, all sources accepted */
STRICT_RTP_LEARN, /*! Accept next packet as source */
@@ -2477,7 +2479,11 @@ static int __rtp_recvfrom(struct ast_rtp_instance *instance, void *buf, size_t s
/* Any further connections will be existing since this is now established */
dtls->connection = AST_RTP_DTLS_CONNECTION_EXISTING;
/* Use the keying material to set up key/salt information */
res = dtls_srtp_setup(rtp, srtp, instance, rtcp);
if ((res = dtls_srtp_setup(rtp, srtp, instance, rtcp))) {
return res;
}
/* Notify that dtls has been established */
res = RTP_DTLS_ESTABLISHED;
} else {
/* Since we've sent additional traffic start the timeout timer for retransmission */
dtls_srtp_start_timeout_timer(instance, rtp, rtcp);
@@ -4750,6 +4756,12 @@ static struct ast_frame *ast_rtcp_read(struct ast_rtp_instance *instance)
/* Read in RTCP data from the socket */
if ((res = rtcp_recvfrom(instance, read_area, read_area_size,
0, &addr)) < 0) {
if (res == RTP_DTLS_ESTABLISHED) {
rtp->f.frametype = AST_FRAME_CONTROL;
rtp->f.subclass.integer = AST_CONTROL_SRCCHANGE;
return &rtp->f;
}
ast_assert(errno != EBADF);
if (errno != EAGAIN) {
ast_log(LOG_WARNING, "RTCP Read error: %s. Hanging up.\n",
@@ -4947,6 +4959,12 @@ static struct ast_frame *ast_rtp_read(struct ast_rtp_instance *instance, int rtc
/* Actually read in the data from the socket */
if ((res = rtp_recvfrom(instance, read_area, read_area_size, 0,
&addr)) < 0) {
if (res == RTP_DTLS_ESTABLISHED) {
rtp->f.frametype = AST_FRAME_CONTROL;
rtp->f.subclass.integer = AST_CONTROL_SRCCHANGE;
return &rtp->f;
}
ast_assert(errno != EBADF);
if (errno != EAGAIN) {
ast_log(LOG_WARNING, "RTP Read error: %s. Hanging up.\n",